Yakuyo Hot Tab Jyu-tansan-yu Classic features fine, silky bubbles. It contains a large amount of bicarbonate ions, which are effective for conditions such as sensitivity to cold, stiff shoulders, and lower back pain. [Effects and Efficacy] Sensitivity to cold, lower back pain, stiff shoulders, fatigue recovery, rheumatism, neuralgia, heat rash, sensitivity to cold before and after childbirth, hemorrhoids, bruises, sprains, chilblains, rough skin, chapped skin, cracks, acne, and eczema.